Lowell c



(No Model.)

L. G. MASON.

CRANK FOR SEWING MACHINES.

Patented Aug. 14, 1883.

NVINTUE:

I UNITED: STATES PATENT OFFICE.

LOWELL 0. Mason, 0F PROVIDENCE, RHODE ISLAND.

CRANK FOR SEWING-MACHINES.

SPECIFICATION forming part .of Letters Iatent No. 283,001, dated August 14, 1883.

V Application filed MEY14,1883. (No model.)

,To all whom it may concern.-

Be it known that I, LOWELL O. MAsoN, of the city and county of Providence, and State of Rhode Island, have invented a new and useful Improvement in Cranks for Sewing Masists in providing such a crank-pin with a disk and a stop by which the crank is free to revolve in one direction, but will be instantly stopped if it is attempted to be turned in the opposite direction, as will be more fully set forth hereinafter.

Figure 1 is a view of a foot-treadle and its connection with the crank of a sewing or other machine provided with my improved crankpin. Fig. 2 is a sectional view of the crank pin and the casing provided with the stop. Fig. 3 is aview of the disk secured to the crankpin and the stop. Fig. 4 is a view of a modifi'cation of the device, showing the disk pro vided with ratchet-teeth, and a loose pawl arranged to act as a stop. r

In the drawings, A is the foot-treadle. B

is the connecting-rod, connecting the'foottreadle with the crankO of a sewing-machine, or any other machine operated bya foot-tread- 1e. D is the crank-pin, secured to the crank C. E is a circular disk, secured to or forming part of the crank-pin D. F is a casing or cap secured to the connecting-rod B, loose on the crank-pin, but surrounding the same and it is attempted toturn the crank'in the opposite direction the roller 9, jams inlbetween the disk and the opposites'ide of the contracting slot y and firmly holds the cap against rota tion in this direction, so that the machine can only be turned in one direction, thus, in a sewing-machine, preventing injury to the needle and the bobbin. H

In the modification shown in Fig. 3 the disk E is provided with ratchet-teeth, and the double pawl h is placed into the recess h, so that the case or disk can only be rotated in one direction. I

It will be seen that as the case F is rigidly fixed to the connecting-bar, and that the latter is always maintained in an approximately vertical position, the stop (9 or k) acts entirely by its own gravity, thus dispensing with the use of springs or other means to keep the stop.

up to its working position.

The whole forms a neat and reliable device,

which does not interfere with the ordinary operation. It takes up very little room, is prompt in its action, and not liable to get out of order.

I am aware that stops have been used to prevent sewing-machines from being operated in the, wrong direction 5 but such stops required a cumbersome attachment which interfered and provided with a recess, 9, and thegravitatingstop' seated in said recess, the whole being arranged to drive the crank in one direction and prevent its movement in the opposite direction, substantially as described.

. 2. The combination, with the treadle A, single connecting-rod B, and crank O, of aclutch consisting, substantially as before set forth, of a disk secured to the crank-pin, and a gravitating stop carriedby the connecting-rod and adapted to prevent the movement of the crank in one direction.

LOWELL G. MASOL Witnessesi M. F. BLIGH, a J. A. MILLER, Jr. p 

